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Texas Instruments LM2593HVT-3.3
- Part No.:
- LM2593HVT-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2593HVT-3.3.pdf
- Description:
- IC REG BUCK 3.3V 2A TO220-7
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2593HVT-3.3 from Texas Instruments is a monolithic 150-kHz non-synchronous buck DC-DC converter delivering up to 2 A output current with ±4% output voltage accuracy (3.3 V ±0.132 V), 4.5–60 V input range, and integrated shutdown/soft-start. It operates in TO-263-7 package and serves as primary step-down regulator in industrial power supplies requiring high input voltage tolerance.
For engineers reviewing the LM2593HVT-3.3 datasheet, LM2593HVT-3.3 pinout, LM2593HVT-3.3 application, or LM2593HVT-3.3 equivalent, key selection criteria include guaranteed 2-A load capability, fixed 3.3-V output with no external feedback resistors, 90-μA standby current in shutdown mode, and out-of-regulation error flag with programmable delay - all critical for reliable embedded power design.
Technical Context
The LM2593HVT-3.3 implements a fixed-frequency (150 kHz) current-mode control architecture with internal compensation, enabling stable operation using standard off-the-shelf inductors and capacitors. Its non-synchronous topology uses an integrated N-channel MOSFET switch and requires an external Schottky diode for energy transfer.
It features dual-stage overcurrent protection (peak current limit and thermal shutdown), undervoltage lockout via SD/SS pin control, and a dedicated open-collector Flag pin that asserts low (<1 V) when output drops below 95% of nominal (≤3.135 V), with delay timing set by external capacitor on Pin 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% (3.168–3.432 V) across –40°C to +125°C and 0.2–2 A load - eliminates need for feedback resistor network. |
| Input Voltage Range | 4.5 V to 60 V - supports wide-input industrial, automotive, and telecom power rails without pre-regulation. |
| Max Output Current | 2 A DC continuous - verified under full temperature and line/load conditions with proper thermal management. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact 22–47 µH inductors and reduces EMI compared to lower-frequency alternatives. |
| Quiescent Current | 90 µA typical in shutdown mode - minimizes system standby power loss in battery-backed or always-on applications. |
| Efficiency | 76% typical at VIN = 12 V, IOUT = 2 A - balances thermal performance and component count for cost-sensitive designs. |
| Thermal Resistance | RθJA = 30°C/W (TO-263, 0.5 in² copper) - defines heatsinking requirement for 2-A operation at ambient ≤85°C. |
Pinout & Package
LM2593HVT-3.3 is housed in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad for enhanced heat dissipation. Package dimensions: 10.10 mm × 8.89 mm × 4.57 mm (max height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts 4.5–60 V; requires local 470-µF low-ESR input capacitor to handle switching transients and RMS current. |
| 2 - Output | Internal switch node | Drives external Schottky diode and inductor; swings between ~VIN–1.3 V and –0.5 V during switching cycle. |
| 3 - Flag | Open-collector error flag | Asserts low (<1 V, sink ≤3 mA) when VOUT < 3.135 V; requires external pull-up resistor (e.g., 4.7 kΩ) to logic rail. |
| 4 - Ground | Power and signal reference | Must be connected to low-impedance PCB ground plane; shares thermal pad connection for thermal conduction. |
| 5 - Delay | Flag delay timing | Charged by 3-µA internal current source; 0.1 µF capacitor yields ~43 ms delay before Flag goes high after regulation. |
| 6 - Feedback | Regulation sense | Internally tied to output for fixed 3.3-V version; not user-accessible - simplifies layout and eliminates resistor tolerance errors. |
| 7 - SD/SS | Shutdown/Soft-start control | Pulled high internally; driven low (≤0.6 V) for shutdown (90 µA IQ); capacitor added for controlled VOUT ramp-up. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V output | Eliminates external feedback resistors and associated layout sensitivity - improves production yield and long-term stability. |
| Out-of-regulation error flag | Provides system-level power-good monitoring with programmable delay, enabling safe sequencing in multi-rail systems. |
| Integrated soft-start | Prevents inrush current during startup by linearly increasing duty cycle - avoids tripping upstream current limits or causing input droop. |
| Thermal shutdown + current limiting | Dual-stage protection ensures robustness under overload, short-circuit, or inadequate heatsinking without external circuitry. |
| Low standby current | 90 µA shutdown IQ enables >1-year battery life in maintenance-free remote sensors powered from coin cells or supercaps. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converts 24-V vehicle battery or 48-V industrial bus to clean 3.3-V rail for microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing regulated 3.3-V supply with input transient immunity up to 60 V. Use Value: Withstands load dump (ISO 7637-2 Pulse 5a) and cold-crank (down to 4.5 V) without dropout, ensuring MCU uptime. |
Use Scenario: Powers 3.3-V logic in door modules, seat controllers, and lighting ECUs where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Compact, thermally efficient step-down converter replacing discrete buck solutions with higher BOM count. Use Value: TO-263 package with thermal pad enables 2-A output in <1 cm² footprint - reduces board area vs. TO-220 alternatives. |
| Telecom Remote Radio Unit | Test & Measurement Equipment |
|
Use Scenario: Generates stable 3.3-V supply from 48-V telecom rectifier output in outdoor small-cell base stations. IC Role / Device Role / Timing Role: High-input-voltage buck regulator supporting extended temperature range (–40°C to +125°C junction). Use Value: ±4% output tolerance over full temp/load ensures ADC reference and FPGA I/O compliance without post-regulation. |
Use Scenario: Provides isolated 3.3-V auxiliary rail in portable oscilloscopes and signal generators with strict noise requirements. IC Role / Device Role / Timing Role: Low-noise, fixed-output DC-DC stage feeding analog front-end and clock distribution circuits. Use Value: 150-kHz fixed frequency allows deterministic EMI filtering - simplifies compliance testing vs. variable-frequency competitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2593HV-3.3 | Same silicon, TO-220-7 package; RθJA = 50°C/W (no thermal pad); 14.99 mm × 10.16 mm footprint. | Preferred where through-hole assembly or vertical heatsinking is used; less suitable for high-density SMT layouts. | Select LM2593HV-3.3 only if board assembly process mandates TO-220 or thermal path relies on vertical fin heatsink. |
| LM2678-3.3 | Higher efficiency (88% @ 12 V/2 A), 63-V max input, but no Flag or Delay pins; requires external feedback resistors even for fixed output. | Lacks power-good signaling and programmable delay - unsuitable for systems requiring fault detection or sequenced power-up. | Choose LM2678-3.3 only when efficiency >85% is mandatory and error flag functionality is omitted from system architecture. |
Compared with LM2593HV-3.3, the LM2593HVT-3.3 offers superior thermal performance in SMT layouts due to its TO-263 thermal pad, while LM2678-3.3 trades away supervision features for higher conversion efficiency - making LM2593HVT-3.3 optimal for safety-aware industrial designs needing both reliability and compactness.
Availability
LM2593HVT-3.3 is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, telecom remote radio units, and test & measurement equipment requiring stable component supply with long lifecycle support.
Supply support for LM2593HVT-3.3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2593HV family was designed for rugged, low-component-count DC-DC conversion in harsh environments - targeting industrial, automotive, and telecom applications where input voltage extremes and thermal stress are routine.
FAQ
What is the maximum input voltage rating for LM2593HVT-3.3?
The absolute maximum input voltage for LM2593HVT-3.3 is 63 V, but the recommended operating range is 4.5 V to 60 V. Operation above 60 V risks exceeding internal device stress limits and may reduce long-term reliability. The 60-V upper bound ensures safe margin against transients like ISO 7637-2 load dump pulses commonly seen in automotive systems.
Does LM2593HVT-3.3 require external feedback resistors to set the 3.3-V output?
No, LM2593HVT-3.3 does not require external feedback resistors. Its 3.3-V output is factory-trimmed and internally connected to the Feedback pin (Pin 6), eliminating resistor tolerance errors and layout sensitivity. This fixed configuration simplifies design, improves production consistency, and reduces bill-of-materials cost compared to adjustable versions.
How does the Flag pin on LM2593HVT-3.3 behave during startup and fault conditions?
The Flag pin (Pin 3) is an open-collector output that remains high-impedance until the output reaches regulation (≥3.135 V). After a programmable delay set by the capacitor on Pin 5, it pulls low (<1 V) only if VOUT falls below 95% of nominal. During normal operation, it stays high (with external pull-up) indicating "power good." It sinks up to 3 mA when active.
Can LM2593HVT-3.3 operate at full 2-A load continuously without a heatsink?
LM2593HVT-3.3 can deliver 2 A continuously only with adequate PCB copper area: ≥2.5 in² of 1-oz copper connected to the thermal pad is required to maintain junction temperature ≤125°C at 25°C ambient. Without this, thermal derating applies - e.g., ~1.4 A max at 85°C ambient with 0.5 in² copper. A heatsink is not required if thermal design rules are followed.
What is the purpose of the Delay pin (Pin 5) on LM2593HVT-3.3?
The Delay pin (Pin 5) sets the time interval between output regulation and Flag pin assertion. An internal 3-µA current source charges an external capacitor; when voltage exceeds 1.25 V, the Flag pin transitions high. A 0.1 µF capacitor yields ~43 ms delay, enabling safe power sequencing in multi-rail systems before downstream logic enables.
LM2593HVT-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2593HVT-3.3 FAQ
1.How can I place an order for LM2593HVT-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2593HVT-3.3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2593HVT-3.3 reliable?
The price and inventory of LM2593HVT-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2593HVT-3.3 is usually 5 days.
3.What payment methods are accepted for LM2593HVT-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2593HVT-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2593HVT-3.3?
LM2593HVT-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2593HVT-3.3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2593HVT-3.3?
For technical support, including LM2593HVT-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2593HVT-3.3 requirements.
6.How does Aetrix verify that LM2593HVT-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2593HVT-3.3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2593HVT-3.3 meets industry standards.
7.What is the process for return or replacement of LM2593HVT-3.3?
All LM2593HVT-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2593HVT-3.3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2593HVT-3.3 part is unused and in its original packaging.
Return procedure for LM2593HVT-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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